Moving a mail domain and its users to a different mail server in a multiserver setup

I have several smaller mail only servers and I wish to consolidate these into a larger mail only server. It would seem I can do a rsync of the /var/vmail/* folder from the smaller email servers to the larger server and then just change the server_id in the mail_domain,mail_forwarding, and mail_user tables in dbispconfig on the main cp server. Would have to do a tools ->resync so that the users would be added to the new mail server I think.